Steam 上的某些游戏无法加载。我不知道为什么。我从 3.13.39 升级到内核 3.14.4，但这个问题仍然存在：
[ 81.122225] bbswitch: enabling discrete graphics
[ 81.593271] [drm] Initialized nvidia-drm 0.0.0 20130102 for 0000:01:00.0 on minor 1
[ 81.593276] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 343.22 Thu Sep 11 16:27:43 PDT 2014
[ 81.610223] vgaarb: this pci device is not a vga device
[ 81.610534] nvidia 0000:01:00.0: irq 54 for MSI/MSI-X
[ 81.614761] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614842] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614870] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614896] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614919] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614944] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.614986] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 81.615010] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 82.652914] ACPI Error: Field [TMPB] at 274432 exceeds Buffer [ROM1] size 262144 (bits) (20131218/dsopcode-236)
[ 82.652920] ACPI Error: Method parse/execution failed [\_SB_.PCI0.PEG0.PEGP._ROM] (Node ffff88022647fa00), AE_AML_BUFFER_LIMIT (20131218/psparse-536)
[ 82.669967] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 82.841451] vgaarb: this pci device is not a vga device
[ 83.314224] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 83.318847] [drm] Module unloaded
[ 83.320680] bbswitch: disabling discrete graphics
[ 83.320691] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131218/nsarguments-95)
[ 83.337618] pci 0000:01:00.0: Refused to change power state, currently in D0
我的 Xorg.8.log
$ cat /var/log/Xorg.8.log | grep EE
[ 81.498] (II) NVIDIA(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 81.498] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[ 81.498] (==) NVIDIA(0): RGB weight 888
[ 81.498] (==) NVIDIA(0): Default visual is TrueColor
[ 81.498] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[ 81.498] (**) NVIDIA(0): Option "NoLogo" "true"
[ 81.498] (**) NVIDIA(0): Option "ProbeAllGpus" "false"
[ 81.499] (**) NVIDIA(0): Option "UseEDID" "false"
[ 81.499] (**) NVIDIA(0): Option "UseDisplayDevice" "none"
[ 81.499] (**) NVIDIA(0): Enabling 2D acceleration
[ 81.499] (**) NVIDIA(0): Ignoring EDIDs
[ 81.499] (**) NVIDIA(0): Option "UseDisplayDevice" set to "none"; enabling NoScanout
[ 81.499] (**) NVIDIA(0): mode
[ 82.727] (II) NVIDIA(GPU-0): Found DRM driver nvidia-drm (20130102)
[ 82.728] (II) NVIDIA(0): NVIDIA GPU GeForce GT 750M (GK107) at PCI:1:0:0 (GPU-0)
[ 82.728] (--) NVIDIA(0): Memory: 2097152 kBytes
[ 82.728] (--) NVIDIA(0): VideoBIOS: 80.07.9a.00.4b
[ 82.728] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[ 82.728] (--) NVIDIA(0): Valid display device(s) on GeForce GT 750M at PCI:1:0:0
[ 82.728] (--) NVIDIA(0): none
[ 82.728] (II) NVIDIA(0): Validated MetaModes:
[ 82.728] (II) NVIDIA(0): "NULL"
[ 82.728] (II) NVIDIA(0): Virtual screen size determined to be 640 x 480
[ 82.728] (WW) NVIDIA(0): Unable to get display device for DPI computation.
[ 82.728] (==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
[ 82.728] (--) Depth 24 pixmap format is 32 bpp
[ 82.728] (II) NVIDIA: Using 3072.00 MB of virtual memory for indirect memory
[ 82.728] (II) NVIDIA: access.
[ 82.731] (II) NVIDIA(0): Setting mode "NULL"
[ 82.731] (EE) NVIDIA(0): Failed to initiate mode change.
[ 82.731] (EE) NVIDIA(0): Failed to complete mode change
[ 82.738] Loading extension NV-GLX
[ 82.741] (==) NVIDIA(0): Disabling shared memory pixmaps
[ 82.741] (==) NVIDIA(0): Backing store enabled
[ 82.741] (==) NVIDIA(0): Silken mouse enabled
[ 82.742] (==) NVIDIA(0): DPMS enabled
[ 82.742] Loading extension NV-CONTROL